No screen, apparently, is too small for video, even the one on Apple's Watch.

Twitter's popular Vine mobile video app will come to Apple's Internet-connected wrist gizmo later this year. During Apple's Worldwide Developers Conference on Monday, Kevin Lynch, Apple's vice president of technology, demoed some new functions, including video, that will be possible on the second version of the Watch's operating system, which arrives in the fall.

Still, no matter how many video apps make their way to Apple Watch, it might be some time before you can record video with the Apple Watch. The first-generation model does not have a camera on it, though it can act as a viewfinder for your iPhone camera.

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